JPH08275468A - Iron core of electrical machinery and apparatus and assembling method therefor - Google Patents

Abstract

PURPOSE: To enable the reduction of time required for assembly on the spot by dividing an iron core into two or more blocks, formed by coupling iron core constituting pieces, and joining parts, and inserting iron core constituting pieces in a corresponding shape, or joining parts, into between the blocks on the spot. CONSTITUTION: A plurality of iron core constituting pieces 1, 2 are stacked and partially bonded together into one piece using adhesive. Thus a transformer iron core is formed. Its thickness can be increased without increasing loss by bonding a plurality of iron core constituting pieces together for iron core laminating work. This makes it possible to very simply assemble the iron core of an electrical machine or apparatus on the spot in a short time. That also makes it to simply manufacture a large quantity of units of laminating work, which enables the reduction of time required for assembly on the spot.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling an iron core and a laminated working unit of electric equipment such as a transformer and a generator.

[0002]

2. Description of the Related Art One of the problems with large electric devices is that they are restricted in transportation. Particularly in the case of land transportation, rail or road conditions limit the weight and size of equipment. Therefore, a method has been adopted in which the device is disassembled and transported, and then transported to the site and then reassembled at the site, and a device structure corresponding to such transportation means has been developed.
The iron core, which is a major component of electrical equipment, is now being laminated locally.

[0003]

A problem when the assembly work is carried out locally is that the construction period becomes long. Therefore, it is desired to shorten the local process as much as possible. Since the iron core of a large electric device is constructed by laminating an extremely large number of thin steel plates, the work is extremely troublesome and is a bottleneck for shortening the construction period at the site. The present invention has been made based on the above circumstances, and provides an iron core of an electric device and a method of assembling the iron core, which can shorten the assembling time in the field.

[0004]

An iron core of an electric device according to the present invention is divided into two or more block portions formed by binding the iron core pieces and an intermediate joint between them, and the space between the blocks is divided. The joint is characterized in that an iron core piece having a shape corresponding to the joint is inserted at the site.

[0005]

In the iron core of the electric equipment of the present invention having the above-mentioned structure, it is possible to shorten the assembling time on site by binding a plurality of iron core pieces and using them as a unit for iron core laminating work or assembling work.

[0006]

1 is an external view of a stacking work unit according to the present invention, and FIG. 2 is a vertical sectional view thereof. These figures show an example in which the present invention is applied to the assembly of a transformer core, and a plurality of core pieces 1 and 2 are stacked and the adhesive 3 is partially used to bind them together. is there. The fact that the iron core laminating work takes a long time is because the iron core pieces constituting the iron core are thin and the number thereof is extremely large. In order to reduce the man-hours and the work period, it is sufficient to make the iron core piece thick, but there is a disadvantage in that the eddy current loss increases. In order to increase the thickness without increasing the loss, a plurality of iron core pieces may be bound to form an iron core laminating work unit. FIG. 1 and FIG. 2 show a stacking work unit constructed according to the above concept.

FIG. 3 is a block diagram of a transformer core. In this figure, the leg iron core 4 is assembled as a block with the lower yoke iron core, and the upper yoke iron core 5 is assembled as a block. Each iron core block is formed by stacking iron core pieces formed by cutting an electromagnetic steel plate by slightly shifting them. A cross section taken along the line AA of FIG. 3 is shown in FIG.
Shown in Although the transformer core is configured as a closed magnetic circuit, the trapezoidal core piece 6 shown in FIG. 5 is inserted into the joint between the core blocks 4 and 5 to form a closed magnetic circuit. Is done.

By bundling the iron core pieces in advance as described above, the number of man-hours for assembling work at the site can be greatly reduced. Since the iron core blocks 4 and 5 are bundles of all the iron core pieces in advance, it is not necessary to stack the iron core pieces on-site at this portion. Only insertion work is required.

Since this trapezoidal core piece is small and easy to handle, the work period for assembling the core on site can be significantly shortened.

In the above embodiment, instead of inserting the iron core pieces 6 to be inserted into the joints one by one, as shown in FIG. 6, a plurality of pieces may be bundled in advance and then inserted. Good. When doing so, the working time can be further shortened.

Although the above embodiments relate to the transformer core, the present invention can also be applied to a rotating machine. FIG. 7 is an iron core block 7 for forming a ring-shaped iron core of a rotating machine.
Indicates. The iron core block 7 is formed by stacking fan-shaped iron core pieces 8 forming a part of a ring while gradually shifting them in the circumferential direction and binding them as a block. FIG. 8 shows a cross section of the joint portion of the core block. In this figure, the iron core block 7 is positioned and aligned in a ring shape, and the small fan-shaped iron core piece 9 shown in FIG. It has a ring-shaped iron core.

Welding is a means for binding a plurality of iron core pieces. When bundling by welding, there is a problem in that a short circuit that electrically surrounds the magnetic flux is formed by the iron core piece and the weld by electrically short-circuiting at the weld. In such a case, an eddy current flows between the layers to cause a loss, which causes an increase in the temperature of the iron core and a decrease in the efficiency of the equipment. The following examples are intended to prevent the inter-layer eddy currents of binding due to the above welding. In FIG. 10, an iron core laminating work unit in which two iron core pieces 10 are stacked and bound by two welding portions 11 is shown. Now, when an AC magnetic flux as indicated by an arrow Φ flows in the front-back direction of the figure, a circuit in which an eddy current i flows in the left-right and up-down directions of the figure is created, which causes loss. The problem of such eddy current loss can be solved by appropriately selecting the arrangement of the welded portions. That is, it suffices that a large AC magnetic flux does not flow between the two welds. In FIG. 11, two iron core pieces 10 are stacked so that the line connecting the positions of the two welds 11 is parallel to the direction of the magnetic flux. As described above, if the magnetic flux does not flow between the two welds, eddy current flowing between the layers is not generated and the loss is not likely to increase.

FIG. 12 shows an embodiment in which the above principle is applied to a transformer core. In this embodiment, two core pieces 1 for a transformer are stacked and bundled by the welded portions 11 and 12 to form a binding work unit. The two welds 11 and 12 are
The straight line connecting these two points is parallel to the direction of the main magnetic flux Φ. In this iron core laminating work unit, four are shown in FIG.
The closed magnetic circuit is constructed as follows. The two welds in each stacking work unit are electrically short-circuited, but since they do not intersect the magnetic flux Φ, no eddy current flows. Therefore, according to the above-mentioned stacking work unit, the man-hours of the stacking work can be halved without deteriorating the loss characteristic.

FIG. 14 shows an embodiment in which the above principle is applied to a rotary machine iron core. In this embodiment, a laminating work unit for a rotor core of a rotating machine is shown. Two fan-shaped core pieces 13 forming a part of the ring-shaped core are stacked, and these are bound at two positions on the end face by welding. Two welds 1
The arc connecting 4 is parallel to the main magnetic flux flowing in the circumferential direction, and no eddy current due to the main magnetic flux Φ is generated.

FIG. 15 shows an embodiment in which the above principle is applied to the rotor core of a rotating machine. The rotor core 15 of the rotating machine is located at a position facing the stator core 16 on the outer periphery thereof, and the stator core 16 is slotted, so that harmonic magnetic flux flows. In the figure, the arrow indicates the direction of the harmonic.

If harmonics flow across the welds 17, eddy currents flow and losses occur. In order to suppress this eddy current loss, the amount of magnetic flux flowing across the two welds 17 may be zero. In the figure, the welded part 17
Is set to 4 times the pole pitch of the harmonic magnetic flux. By setting the spacing to be an even multiple of the harmonic pole pitch, the positive and negative sides of the magnetic flux cancel each other, thus preventing an eddy current flowing through the weld 17.

In order to reduce the number of man-hours required for the iron core laminating work on site, it is necessary to bundle a plurality of iron core pieces in advance in a factory to prepare a laminating unit. In the case of a large iron core, the number of stacking work units is also large. A large man-hour is required to prepare a large number of stacking work units. For that purpose, a means for producing a large number of iron core lamination work units at a time is required. When binding the iron core pieces by welding, first bind many pieces at once,
Thereafter, this is separated into a predetermined number of sheets to make a large number of stacking work units. In bundling by welding, the most troublesome task is the setup for welding. In order to individually weld a large number of stacking work units, the time required for setup increases in proportion to the number. However, if the above is done, the setup can be done only once, and therefore the time required for binding can be greatly shortened.

FIG. 16 shows a method of manufacturing a stacking work unit. In this figure, a large number of iron core pieces 18 are laminated at one time, and the whole welded portion 19 is bound together.
Next, as shown in the figure, the wedge 20 is tapped from the side surface where the welded portion 19 is absent, and divided into a predetermined number of sheets. Since the weld is localized, the bundling force is not great and is therefore easily split by the insertion of the wedge 20. Also, the number of man-hours required for welding for binding is greatly reduced, and a large number of stacking work units can be created in a short time.

By adopting the above-mentioned laminating work unit, not only the number of man-hours for laminating the iron core at the site is reduced, but also the manufacturing of the iron core laminating work unit in the factory becomes very easy. An adhesive may be used as one of the means for binding the core pieces. Among them, there is a method of applying a heat-bonding type coating on the surface of the electromagnetic steel sheet. The surface before heating has no adhesiveness, so that the core piece is easily punched. When the punched core pieces are stacked and heated, these core pieces are integrated by adhesion. In order to divide this united product into a predetermined number of sheets, it is only necessary to stack a predetermined number of pieces having an adhesive coating and pieces having a non-adhesive surface and heat them.

If there is an adhesive coating between the two iron core pieces, the two pieces are bonded and bound, and if they are non-adhesive surfaces, the two pieces are not bonded and remain separated. Is. Therefore, according to this method, it is possible to obtain a large number of stacking work units each of which is bound together.

0.5 coated with a heat adhesive coating
A core piece made by punching out a non-oriented electrical steel sheet having a thickness of mm is heat-bonded. FIG. 17 shows a laminated state of the core pieces. Two pieces of the core piece 21 having the non-adhesive coating 23 and the core pieces 22 of the same shape having the adhesive coating 24 are alternately stacked, and the whole is heated in this state. An adhesive coating 2 is provided between the iron core pieces 21 and 22.
4 intervenes, so the two are glued together by heating. On the other hand, when the iron core pieces 21 are overlapped with each other, since the non-adhesive coating film 23 is interposed therebetween, they are not adhered even when heated. When stacked as shown in FIG. 17, a large number of stacking work units, each of which is bound four by four, can be obtained by heating once.

In the above embodiment, four iron core pieces form a laminated work unit, but the invention is not limited to this. For example, it is possible to form two stacking work units.

[0023]

As is apparent from the above, according to the present invention, the on-site assembly of the iron core of the electric device can be extremely easily performed in a short construction period. In addition, since a large number of stacking work units can be easily manufactured, it is possible to shorten the construction period for on-site assembly also from this aspect.

[Brief description of drawings]

FIG. 1 is an external view of a stacking work unit according to the present invention.

FIG. 2 is a vertical sectional view thereof.

FIG. 3 is a configuration diagram of a transformer core according to the present invention.

FIG. 4 is a sectional view taken along the line AA in the previous figure.

FIG. 5 is a plan view showing an example of an iron core piece to be inserted into a joint portion.

FIG. 6 is a front view showing an example of how to stack the stacking work units.

FIG. 7 is a plan view showing an iron core block for forming a ring-shaped iron core of a rotating machine.

FIG. 8 is a cross-sectional view of a joint portion of the core block.

FIG. 9 is a plan view showing another example of the iron core element to be inserted into the joint portion.

FIG. 10 is a perspective view for explaining an interlayer eddy current when binding is performed by welding.

FIG. 11 is a perspective view showing a state in which an interlayer eddy current is prevented when binding is performed by welding.

FIG. 12 is a perspective view of a stacking work unit of a transformer that is bundled by welding.

FIG. 13 is a plan view of a transformer core constructed according to the present invention.

FIG. 14 is a perspective view of a work unit for laminating an iron core of a rotary electric machine rotor configured according to the present invention.

FIG. 15 is a plan view of another example of the iron core of the rotary electric machine rotor configured according to the present invention.

FIG. 16 is a perspective view of an example of means for producing a large number of stacking work units.

FIG. 17 is a front view of another example of means for producing a large number of stacking work units.

[Explanation of symbols]

 1, 2, 6 ... Iron core element 3 ... Adhesive 4, 5 ... Iron core block

Claims (6)

[Claims] 1. An iron core piece having a shape in which the iron core is divided into two or more block portions formed by binding the iron core pieces and a joint portion between them, and the joint portion between the blocks corresponds to the joint portion. The iron core of electrical equipment is characterized by being inserted in the field. 2. The iron core of an electric device according to claim 1, wherein a plurality of iron core pieces for the joint portion are bound together and inserted between both joint iron core blocks to be assembled. 3. An iron core is constructed by assembling a laminated work unit in which a plurality of iron core pieces are bound together, in which one end face of one of the iron core pieces intersects with the main magnetic flux. An iron core for electrical equipment, which is characterized in that it was performed at welds at various locations. 4. An iron core formed by stacking a plurality of iron core pieces for a rotating electric machine and binding them by welding and assembling the laminated working unit, wherein the welded portion is provided in a portion facing the void of the rotating electric machine. An iron core for electric equipment, characterized in that the intervals between the welded parts are set to a value that is an even multiple of the harmonic pole pitch or a value close thereto. 5. A plurality of core pieces are laminated, a part of the side surface of the laminated body is welded to bind the whole into one, and the core pieces are divided into required number of pieces. Assembling method of stacking work unit. 6. An iron core piece made of an electromagnetic steel sheet having a heat-adhesive resin coating and an iron core piece made of an electromagnetic steel sheet having a non-adhesive coating are prepared, and the former iron core pieces are provided every predetermined number. A method of assembling a stacking work unit, characterized in that the latter two pieces of iron core pieces are sandwiched between and stacked, heat-treated and bonded together to obtain a stacking work unit divided into a predetermined number of pieces.